Q1: [H]ow to fix the error?
Stop calling the do_settings() function in this line. It is not a WordPress function and it is apparently not a function that you have defined. Perhaps you meant to use one of these functions.
<?php do_settings( 'mhomepage_option_group' ); ?>
Q2: [W]hat is the correct file name in
<form method="post" action="options.php">?
options.php
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